/**
 *    Copyright (C) 2025-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#include "mongo/db/local_executor.h"

#include "mongo/executor/network_interface_factory.h"
#include "mongo/executor/thread_pool_task_executor.h"
#include "mongo/rpc/metadata/egress_metadata_hook_list.h"
#include "mongo/util/concurrency/thread_pool.h"

namespace mongo {

namespace {

const auto localExecutor =
    ServiceContext::declareDecoration<std::shared_ptr<executor::TaskExecutor>>();

}

std::shared_ptr<executor::TaskExecutor> getLocalExecutor(ServiceContext* service) {
    auto executor = localExecutor(service);
    invariant(executor);
    return executor;
}

std::shared_ptr<executor::TaskExecutor> getLocalExecutor(OperationContext* opCtx) {
    return getLocalExecutor(opCtx->getServiceContext());
}

void setLocalExecutor(ServiceContext* service, std::shared_ptr<executor::TaskExecutor> executor) {
    localExecutor(service) = std::move(executor);
}

std::shared_ptr<executor::TaskExecutor> createLocalExecutor(ServiceContext* serviceContext,
                                                            const std::string& name) {
    ThreadPool::Options tpOptions;
    tpOptions.threadNamePrefix = name + "-";
    tpOptions.poolName = name + "ThreadPool";
    tpOptions.maxThreads = ThreadPool::Options::kUnlimited;
    tpOptions.onCreateThread = [serviceContext](const std::string& threadName) {
        Client::initThread(threadName,
                           serviceContext->getService(ClusterRole::ShardServer),
                           Client::noSession(),
                           ClientOperationKillableByStepdown{false});
    };

    class BlockerHook : public rpc::EgressMetadataHook {
    public:
        Status writeRequestMetadata(OperationContext*, BSONObjBuilder*) override {
            tasserted(ErrorCodes::IllegalOperation,
                      "Remote task is prohibited to schedule on local task executor");
        }
        Status readReplyMetadata(OperationContext*, const BSONObj&) override {
            tasserted(ErrorCodes::IllegalOperation,
                      "Remote task is prohibited to schedule on local task executor");
        }
    };

    auto hookList = std::make_unique<rpc::EgressMetadataHookList>();
    hookList->addHook(std::make_unique<BlockerHook>());

    return executor::ThreadPoolTaskExecutor::create(
        std::make_unique<ThreadPool>(tpOptions),
        executor::makeNetworkInterface(name + "Network", nullptr, std::move(hookList)));
}

}  // namespace mongo
